First Steps Towards an Intelligent Laser Welding Architecture Using Deep Neural Networks and Reinforcement Learning

• Published in: Procedia technology Vol. 15; pp. 474 - 483
• Main Authors: Günther, Johannes, Pilarski, Patrick M., Helfrich, Gerhard, Shen, Hao, Diepold, Klaus
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2014
• Subjects: control; Deep learning; laser welding; prediction; reinforcement learning; Deep learning; prediction; control; laser welding; reinforcement learning
• ISSN: 2212-0173; 2212-0173
• DOI: 10.1016/j.protcy.2014.09.007

To address control difficulties in laser welding, we propose the idea of a self-learning and self-improving laser welding system that combines three modern machine learning techniques. We first show the ability of a deep neural network to extract meaningful, low-dimensional features from high-dimensional laser-welding camera data. These features are then used by a temporal-difference learning algorithm to predict and anticipate important aspects of the system's sensor data. The third part of our proposed architecture suggests using these features and predictions to learn to deliver situation-appropriate welding power; preliminary control results are demonstrated using a laser-welding simulator. The intelligent laser-welding architecture introduced in this work has the capacity to improve its performance without further human assistance and therefore addresses key requirements of modern industry. To our knowledge, it is the first demonstrated combination of deep learning and Nexting with general value functions and also the first usage of deep learning for laser welding specifically and production engineering in general. This work also provides a unique example of how predictions can be explicitly learned using reinforcement learning to support laser welding. We believe that it would be straightforward to adapt our approach to other production engineering applications.